Issue 5 and Volume 118.

INDUSTRIAL FIRE SAFETY DEPARTMENTS LAST MONTH we presented several formulas for use when dealing with so-called perfect gases. In this issue, some additional formulas are presented, and practical examples worked out. In order to solve for the unknown quantity it may be necessary in some instances to transpose or rearrange the equation. This may make it necessary to brush up on our high school algebra. It will be noted that many of the formulas are approximate only; but in most practical problems an approximation will suffice. For instance, calculations show the density or unit weight of ethane to be 0.0779 pounds per cubic foot, whereas the handbook tables show 0.079. Such slight errors are not important in most of our problems. Let us consider a closed vessel containing a volatile liquid with air or other gas in the space above it. It has been standing long enough for evaporation to…

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